I am a senior high school student in the Philippines. Can you tell me how to identify different types of stars based on their spectral class?
A spectral class of a star refers to its temperature and chemical composition. There are seven spectral classes, namely O, B, A, F, G, K, and M. Each class represents a different temperature and chemical composition. For example, an O-type star is the hottest with a temperature of over 20,000 Kelvin and a high amount of metals. A G-type star, on the other hand, is the most common type of star with a temperature of around 5,800 Kelvin and a composition of mostly hydrogen and helium.